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The dude has a uninsulated plenum in a crawl, its gonna sweat regardless of coil temp.

Any uninsulated plenum in a non conditioned space is going to be creating a small flood, not just a little condensation. Sounds like it may be internally insulated and Mr. homeowner doesn't know any better. I've seen plenums sweat in conditioned spaces if coil is too cold due to some other problem.